It is mainly used by the Northern American booktrade, and online sellers like Barnes & Noble, Amazon and Baker & Taylor.
[2] In the BISAC system, Biography and Autobiographies (BIO) comes before works of Fiction (FIC) and Religion (REL).
For example, Stefan Zweig's novel that re-tells the Magellan expedition would be filed under FIC014030 (Fiction: History: Historical: Renaissance).
Some libraries, though, have decided to group one novelist's works under the same topic if the author has shown a clear preference for one.
Some reasons given were BISAC being more intuitive, it was more usable by non-experts, and the books of similar topics being grouped together has allowed for better seating arrangements in libraries.